Barton 'rows with drunken Winehouse'

Amy Winehouse and Mischa Barton were involved in a heated exchange at a London pub, it has been reported.

Winehouse, who met Barton at The Hawley Arms in Camden during the singer's alleged 16-hour drinking session on Monday night, was apparently angered after the former O.C. actress criticized her for being drunk at the early hour of 8pm.

A source told The Sun: "It all started so well, the girls embraced like sisters and chatted excitedly about what they'd been up to.

"Mischa didn't have anything to drink at all. She ordered a tonic with lemon and said that it feels like she's having a drink. Amy was in with some friends, and she got on the vodka, then the sambuca shots.

"Everyone had moved to the private room upstairs and Amy was starting to get a bit maudlin. She'd been fine and jolly earlier but as usual, that soon changed.

"Mischa looked concerned and said that [Amy] had had enough for the night. She wasn't being a killjoy. Amy looked upset."

A row then reportedly broke out between the two in which Barton tried to wrestle a drink away from the 'Rehab' singer.

The source added: "Obviously [Amy] was drunk and didn't take it well. She yelled at Mischa that it was none of her business and her mate told her to leave it."

Barton, whose rep recently denied that the 24-year-old was moving to London, announced that she had given up drinking alcohol last month.